<!doctype html>
<html>

	<head>
		<meta charset="utf-8">
		<title></title>
		<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
		<style>
			div{
				width:300px;
				height:300px;
				background: red;
				color:#fff;
				text-align: center;
				line-height: 300px;
			}
			div:hover{
				width:300px;
				height:300px;
				background: #ccc;
				border:8px solid #f00;
				box-sizing: border-box;
				color:#f00;
				text-align: center;
				line-height: 292px;
			}
		</style>
	</head>

	<body>
		<div>
			这是一个第v
		</div>
	</body>

</html>
